Eaton FB3040L 40A 3-Pole 600 V Circuit Breaker

Meet the Eaton FB3040L 40A 3-Pole 600 V Circuit Breaker — a purpose-built protection device designed for reliable, three-phase power distribution. Identified by part number FB3040L, this breaker delivers precise overcurrent protection for circuits up to 40 A and supports system voltages up to 600 V, making it a solid choice for industrial, commercial, and light manufacturing environments.

Three-pole protection for balanced, safer power

With a dedicated 3-pole design, the FB3040L guards each phase of your 3-phase circuit, helping prevent uneven loading that can lead to equipment damage. The 40 A rating ensures motors, feeders, and distribution lines stay protected from overload without nuisance trips, while the 600 V rating covers most commercial and light industrial applications.

Key benefits that matter in the real world

• Reliable three-phase protection: simultaneous interruption on all three conductors when fault current exceeds the setting
• Clear, straightforward identification: part number FB3040L is easy to order and replace within Eaton systems
• Compatibility within Eaton ecosystem: designed to integrate with Eaton panels and distribution assemblies for consistent performance
• Durable, maintenance-friendly design: built for long service life in daily operation
• Versatile installation across industrial layouts: suited for motor feeds, feeders, and service entrances in 3-phase setups

Ideal applications

Perfect for safeguarding 3-phase motors, pumps, conveyors, HVAC equipment, and other machinery in manufacturing floors, facilities with three-phase power, and large commercial environments. Because it’s rated for 600 V systems, it supports higher-voltage equipment common in industrial settings.

Installation and usage tips

• Confirm your circuit requires a 40 A, 3-pole breaker and a 600 V maximum rating
• Install in a compatible Eaton panel or enclosure following manufacturer mounting guidelines
• Ensure proper bus bar connections and balanced phase loading to minimize nuisance trips
• Keep spare FB3040L units on hand for quick replacement and reduced downtime

Specifications at a glance

• Current rating: 40 A
• Poles: 3
• Voltage rating: 600 V
• Part number: FB3040L
• Category: Eaton circuit breaker